Modification of slot-machine preferences through the use of a conditional discrimination paradigm

The present experiment investigated the impact of contextually trained discriminations on gambling behavior. Nine recreational slot-machine players were initially exposed to concurrently available computerized slot machines that were each programmed on random-ratio schedules of reinforcement and differed only in color. All participants distributed responding equally across the two slot machines. A conditional discrimination procedure was then used to teach the contextual cues representing the arbitrary relations of "greater than" and "less than." Following contextual cue training, participants were reexposed to the concurrent slot-machine task. After training of the contextual cues, a higher proportion of responses were made to the slot machine that shared formal properties (i.e., color) with the contextual cue representing "greater than."     

Speech act conditions as tools for reconstructing argumentative discourse

According to the pragma-dialectical approach to argumentation, for analysing argumentative discourse, a normative reconstruction is required which encompasses four kinds of transformations. It is explained in this paper how speech act conditions can play a part in carrying out such a reconstruction. It is argued that integrating Searlean insights concerning speech acts with Gricean insights concerning conversational maxims can provide us with the necessary tools. For this, the standard theory of speech acts has to be amended in several respects and the conversational maxims have to be translated into speech act conditions. Making use of the rules for communication thus arrived at, and starting from the distribution of speech acts in a critical discussion as specified in the pragma-dialectical model, it is then demonstrated how indirect speech acts are to be transformed when reconstructing argumentative discourse.     

An examination of procedures for determining the number of clusters in a data set

A Monte Carlo evaluation of 30 procedures for determining the number of clusters was conducted on artificial data sets which contained either 2, 3, 4, or 5 distinct nonoverlapping clusters. To provide a variety of clustering solutions, the data sets were analyzed by four hierarchical clustering methods. External criterion measures indicated excellent recovery of the true cluster structure by the methods at the correct hierarchy level. Thus, the clustering present in the data was quite strong. The simulation results for the stopping rules revealed a wide range in their ability to determine the correct number of clusters in the data. Several procedures worked fairly well, whereas others performed rather poorly. Thus, the latter group of rules would appear to have little validity, particularly for data sets containing distinct clusters. Applied researchers are urged to select one or more of the better criteria. However, users are cautioned that the performance of some of the criteria may be data dependent.The authors would like to express their appreciation to a number of individuals who provided assistance during the conduct of this research. Those who deserve recognition include Roger Blashfield, John Crawford, John Gower, James Lingoes, Wansoo Rhee, F. James Rohlf, Warren Sarle, and Tom Soon.     

The Revelation Argument. A 'Communicational Fallacy'

In this paper it is argued that much can be gained for the analysis and evaluation of arguing when fallacies are not, or not only, conceived of as flawed premise–conclusion complexes but rather as argumentative moves which distort harmfully an interaction aiming at resolving communication problems argumentatively. Starting from Normative Pragmatics and the pragma-dialectical concept of fallacy, a case study is presented to illustrate a fallacy which is termed the 'revelation argument' because it is characterized by an interactor's revealing her thoughts and/or emotions to the addressees and claiming that these would have justificatory or refutatory potential with respect to the problem discussed. Although the revelation argument may not be a paradigm case of resolution- hindering moves, it is an extreme case of flawed reasoning that illustrates plainly the advantages of a communicational perspective on arguing and fallacies.     

To stay or to leave? Decision rules for partner species relocation in two symbiotic pairs of desert beetles

Four nocturnal Kalahari desert tenebrionid beetles live in closely associated species pairs. The larger member of each pair, Parastizopus and Gonopus, are the primary burrowers while their smaller associates, Eremostibes and Herpiscius, inhabit the burrows with them and feed on detritus the larger beetles carry in. During summer drought, the two large species have different emergence times, surface activity patterns (vagilities) and different probabilities that burrows will be reoccupied before sunrise or remain empty for longer periods. Because their partners leave the burrows, the smaller species must make a decision either to stay in the expectation of a burrow being reinhabited, or leave and locate a new partner. The vagility and burrow fidelity of the associating species were studied using marked individuals in free-living populations. Field inclusion/exclusion experiments to test what influences the decision process showed that neither continual partner presence nor food induced the smaller beetles to remain. Different percentages, depending on species, left overnight. For both associates, these proportions corresponded exactly to the probability that the burrow would not be inhabited by their partner species the next day. Neither species predicted the probability of burrow reoccupation after a short vacancy and adopted a “waiting” strategy. Received: 13 January 1998 / Accepted after revision: 20 May 1998     

The usefulness of the averaging rule in consumer studies: A partial replication with an eye at neuroeconomics

IntroductionInformation Integration Theory models how different pieces of information are combined by people into unified judgments. Its contribution to decision-making and to consumer studies distinctly relies on a set of empirically established algebraic models for reflecting the cognitive structure of judgments and decisions (cognitive algebra). Among these, the averaging model has particular properties, allowing for operationally distinguishing between the elusive notions of psychological value and importance.ObjectivesThe main goal of the paper is to support the applicability and robustness of the averaging model in consumer studies, by partially replicating a published study that documented averaging. Additionally, it tentatively explores potential contributions of the averaging model to neuroeconomics, by simultaneously recording ratings and electroencephalographic (EEG) responses.MethodsTwenty-five participants rated on a satisfaction scale (format 0-20) a set of experimental conditions arising from the full factorial combination of three levels of sneakers’ branded models and three levels of purchase prices, expanded with conditions in which brands were presented in isolation (sub-design). Simultaneous electrophysiological monitoring was performed with an EEG mask (international system 10-20, referenced to the mastoid apophyses). Segmentation and processing of evoked response potentials were done in Matlab. Both ratings and magnitudes of event-related potentials (ERP) components were analyzed through inspection of the factorial plots with the support of repeated-measures ANOVAs.ResultsThe rating responses revealed an averaging model, with equal weighting in a cluster of subjects and differential weighting in another, but more overall importance of the branded model variable in both cases. The only tentative suggestions of relevant neural correlates involved the LPP and P300 components of the ERP and a reduced number of EEG channels (P4, P3, Fz and T3).ConclusionsThe averaging model is robustly applicable and useful in consumer studies, both for measurement (value and importance) and consumer segmentation (cognitively based clusterization) purposes. While calling attention to the later components of the ERP at specific topographies, the paucity of EEG results suggests that ERP peak amplitude may not be a useful measure for the purpose. Apart from that, a functional measurement approach to neuroeconomics seems feasible in principle and an explorable path in the future.     

What ends a worry bout? An analysis of changes in mood and stop rule use across the catastrophising interview task

This paper reports the results of two experiments designed to test predictions from the mood-as-input hypothesis about the factors that contribute to the ending of a worry bout. Experiment 1 looked at changes in self-reported mood across a catastrophising interview task. Experiment 2 investigated whether there were any changes in stop rule deployment between the beginning and end of a catastrophising interview task. Experiment 1 demonstrated that worriers tended to show increases in negative mood and decreases in positive mood over the course of catastrophising. In Experiment 2, participants exhibited a significant shift away from endorsing the use of 'as many as can' stop rules and a significant increasing tendency to endorse the use of 'feel like continuing' stop rules over the course of catastrophising. These results suggest that worriers exhibit increases in negative mood across the worry bout, but shift from the use of 'as many as can' to 'feel like continuing' stop rules. Mood-as-input hypothesis predicts that if high worriers ask the question "do I feel like continuing?" in the context of increasing negative mood, this will imply that the activity is no longer enjoyable or profitable and should be terminated. The results are discussed in the context of mood-as-input accounts of pathological worrying and the therapeutic implications of these findings are reviewed.     

A reanalysis of Lord’s statistical treatment of football numbers

Stevens’ theory of admissible statistics [Stevens, S. S. (1946). On the theory of scales of measurement. Science, 103, 677680] states that measurement levels should guide the choice of statistical test, such that the truth value of statements based on a statistical analysis remains invariant under admissible transformations of the data. Lord [Lord, F. M. (1953). On the statistical treatment of football numbers. American Psychologist, 8, 750-751] challenged this theory. In a thought experiment, a parametric test is performed on football numbers (identifying players: a nominal representation) to decide whether a sample from the machine issuing these numbers should be considered non-random. This is an apparently illegal test, since its outcomes are not invariant under admissible transformations for the nominal measurement level. Nevertheless, it results in a sensible conclusion: the number-issuing machine was tampered with. In the ensuing measurement-statistics debate Lord’s contribution has been influential, but has also led to much confusion. The present aim is to show that the thought experiment contains a serious flaw. First it is shown that the implicit assumption that the numbers are nominal is false. This disqualifies Lord’s argument as a valid counterexample to Stevens’ dictum. Second, it is argued that the football numbers do not represent just the nominal property of non-identity of the players; they also represent the amount of bias in the machine. It is a question about this property-not a property that relates to the identity of the football players-that the statistical test is concerned with. Therefore, only this property is relevant to Lord’s argument. We argue that the level of bias in the machine, indicated by the population mean, conforms to a bisymmetric structure, which means that it lies on an interval scale. In this light, Lord’s thought experiment-interpreted by many as a problematic counterexample to Stevens’ theory of admissible statistics-conforms perfectly to Stevens’ dictum.     

Children’s informational reliance during inconsistent communication: The public-private distinction

This study examined whether children recognize that when there is a discrepancy between what is expressed in public versus what is expressed in private, the private expression is more indicative of the true state of affairs. Participants (3-, 4-, and 5-year-olds) were shown a video in which a girl expressed that she liked the refreshments her friend had made when the friend was present but expressed dislike when the friend was not present. The results of the first two experiments revealed that older children were significantly more likely to rely on private information than on public information to interpret the inconsistent messages, whereas 3-year-olds were not. In the third experiment, older children performed better when the inconsistency occurred in the nonverbal domain compared with the verbal domain. The finding that even 4-year-olds show some signs of understanding the private-public distinction is remarkable given that previous research on inconsistent communication indicated that children’s understanding typically comes much later. Possible explanations for this discrepancy are discussed.     

Effortful control, executive attention, and emotional regulation in 7–10-year-old children

In this study, self-regulation was investigated in 7- to 10-year-old children using three different measures: (1) parent and child report questionnaires measuring temperamental effortful control, (2) a conflict task assessing efficiency of executive attention, and (3) the mistaken gift paradigm assessing social smiling in response to an undesirable gift. Both efficiency in executive attention and smiling to the undesired gift increased over age. Executive attention was related to both parent-reported temperamental effortful control and smiling, suggesting links between attentional capacities, broad temperament measures, and social situations requiring attentional control.